Heater Fuse

Tiny
FREDNJESS
  • MEMBER
  • 2000 CHEVROLET TRUCK
I've got a 2000 Chevy S10 regular cab 4 cylinder with 55000 miles. This morning, 4 degrees, the heater controls stopped working completely. Any selection on any of the three controls does nothing. I checked the interior fuse box and the HVAC fuse is fine. I then checked the engine bay fuse box and the HVAC 30A fuse was cooked. I replaced it with one of the spare 30A fuses. I fired up the truck with all switches off and turned it to floor heat, fan level 1 and got nothing. Everything on the HVAC control panel does nothing. I have not gone any further. Any advice or direction would be much appreciated. No air is moving. Moving any of the three heater switches does absolutely nothing. Thanks!
Monday, January 15th, 2007 AT 2:57 PM

6 Replies

Tiny
SERVICE WRITER
  • MECHANIC
  • 9,123 POSTS
Sometimes the switch is bad, sometimes the resistor, but usually high will work, blower motor is most common for many. Sometimes you can rap on the motor housing while the switch is on and trigger it to work temporarily. You need to get to the connector of the motor and test it with a test light to see if it is getting power. If it is, you need a motor, if it isn't go one step back into the circuit.

https://www.2carpros.com/articles/how-to-check-a-car-fuse

Check out the diagrams (Below). Please let us know what you find. We are interested to see what it is.
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Monday, January 15th, 2007 AT 8:15 PM
Tiny
FREDNJESS
  • MEMBER
  • 3 POSTS
I checked the truck this morning and yesterdays 30A HVAC had cooked just like th original offender. I have the dash apart along with the underdash skirts. I can access the back of the heating system controls and I've located the fan housing (black, round, and about 6 inches tall). How do I get the fan housing open (there's not much room in there) and where are the wires to the fan motor? I've looked from both sides and can't see where they are. Thanks
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Tuesday, January 16th, 2007 AT 3:26 PM
Tiny
SERVICE WRITER
  • MECHANIC
  • 9,123 POSTS
It should plug in through the outside, that is from the engine compartment. Before you cut into the case, you can check for power there. This guide will help

https://www.2carpros.com/articles/blower-fan-motor-works-on-high-speed-only
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Tuesday, January 16th, 2007 AT 6:12 PM
Tiny
TRAINES3
  • MEMBER
  • 1 POST
Thanks for this post I had this problem had to get a new blower motor cost me $87.00
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Thursday, February 21st, 2019 AT 11:42 AM
Tiny
CINDIE
  • MEMBER
  • 2 POSTS
  • 1992 CHEVROLET TRUCK
  • V8
  • 4WD
  • AUTOMATIC
  • 119,000 MILES
Driving the truck, the A/C was blowing cold, fan was on high when I shut the truck off. 4 hours later I restarted truck and turned the headlights on. The dash lit up except for the A/C-Heater buttons, the vent direction, and fan speed. I tried to turn the A/C on, the fan on, even the heater on--NOTHING! I checked the fuse marked ac heater in fuse box located under left front of dash. Is there another fuse box I should check? Or do I have to replace the whole a/c heater control block?
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Thursday, February 21st, 2019 AT 11:43 AM (Merged)
Tiny
2CARPRO JACK
  • MECHANIC
  • 11,533 POSTS
Remove the controller, check for power at pins, 12, and A, if power at both it is most likely the controller, if no power at 12, check all fusible links at the batt and power center on the firewall. Pin A is fed by the a/c fuse you already checked
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Thursday, February 21st, 2019 AT 11:43 AM (Merged)

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